Thursday, June 11, 2015

Gulf Stream brings ever warmer water into Arctic Ocean

The image below shows sea surface temperature anomalies in the Arctic as at June 9, 2015.

The image below shows the Arctic from a 180° rotated angle, while also showing the high sea surface temperature anomalies that are so prominent in the North Pacific (note also that the scale of sea surface temperature anomalies differs).

One may wonder why sea surface temperature anomalies below zero are visible in the North Atlantic, given that ocean heat is rising rapidly. As the IPCC said in AR5, more than 60% of the net energy increase in the climate system is stored in the upper ocean (0–700 m) during the relatively well-sampled 40-year period from 1971 to 2010, and about 30% is stored in the ocean below 700 m.

The image below further pictures the situation as at June 9, 2015, with large blue and purple areas showing in the North Atlantic where meltwater from the Arctic has spread over time.

Indeed, the accumulation of meltwater over time has created a huge area with relatively cold water that tends to float at the surface, rather than sink, as the meltwater's salt content is very low.

In other words, the ocean underneath the meltwater at the sea surface is much warmer than the temperatures shown on above images. This can be illustrated by the situation near Svalbard. The image below shows the depth of Barents Sea, which is relatively shallow around Svalbard,

As the image shows, cold meltwater with low salt content floats around Svalbard where the water is most shallow. A 'polar front' separates cold and warm water, following the borders of the area where the seafloor is high. Warm, salty water is carried by the Gulf Stream from the (much deeper) Atlantic Ocean into the Arctic Ocean. This warm water collides with cold water east of Svalbard where the seafloor rises steeply, making this warm water come to the surface.

Warm water from the Atlantic also comes to the surface west of Svalbard, where warm and cold water are similarly separated by the height of the seafloor.

The image below shows that on June 8, 2015, sea surface temperatures as high as 11.4°C (52.52°F) were recorded to the south-east of Svalbard (a 9.8°C or 17.64°F anomaly), while sea surface temperatures as high as 7.4°C (45.32°F) were recorded to the west of Svalbard (a 3.5°C or 6.3°F anomaly).

The image below shows the situation on June 21, 2015, when sea surface temperatures as high as 12.5°C (54.5°F) were recorded to the south-east of Svalbard (a 10.2°C or 18.4°F anomaly), while sea surface temperatures as high as 8.5°C (47.3°F) were recorded to the west of Svalbard (a 3.7°C or 6.7°F anomaly) and as high as 7.3°C (45.1°F) further west of Svalbard (a 3.7°C or 6.7°F anomaly).

These spots where warm water comes to the surface give an indication of how high temperatures of the water are below the surface. As more than 90% of the extra heat caused by people's emissions continues to go into oceans, ever warmer water will be carried by the Gulf Stream into the Arctic Ocean, with the danger that this will warm up sediments under the Arctic Ocean seafloor, triggering huge methane eruptions with gigantic warming potential.

The above images picture the situation as at June 8 and June 21, 2015, when summer on the Northern Hemisphere had just started. In other words, temperatures will rise over the next few months. To get an idea of what can be expected, the image below shows the situation as at September 1, 2014, when sea surface temperatures near Svalbard were as high as 17.5°C (or 63.5°F), an anomaly of 11.9°C (or 21.42°F)

On the combination image below, the image on the left shows large areas (red circles) where warmer water is visible through the sea ice, indicating the presence of even warmer water at greater depth in the Arctic Ocean. The image on the right (from an earlier post) roughly shows how ocean heat can be carried by the Gulf Stream from the Atlantic Ocean off the coast of North America into the Arctic Ocean, diving under the sea ice somewhere between Greenland and Svalbard.

Then, there is also the impact of the heat wave in Russia warming up the Arctic Ocean, as indicated by the red circle on the image below.

The image below shows May Northern Hemisphere ocean temperature anomalies with respect to the period 1901-2000, based on NOAA data and with a polynomial trendline added.

ACCELERATED WARMING IN ARCTIC CAUSING MORE CIRRUS CLOUDS

As oceans warm, the atmosphere can be expected to carry more water vapor. This conclusion is supported by studies such as this one. With more water vapor in the atmosphere, storms can be expected to strike with greater intensity. This conclusion is supported by studies such as this one. This situation gets worse as weather gets more extreme.

What makes things even worse is that, as the Gulf Stream keeps bringing ever warmer water into the Arctic Ocean, loss of sea ice in the Arctic Ocean and more open water will be the result. More open water means more opportunity for storms to develop and for water to evaporate into the atmosphere. The combination of more open water, more extreme weather, and more water vapor in the atmosphere leads to ever more severe storms that can come with destructive winds and that can suddenly unleash massive amounts of precipitation.

Studies such as this one warn that plumes above the anvils of severe storms can bring water vapor up into the stratosphere, contributing to the formation of cirrus clouds that block a lot of heat that would otherwise be radiated away, from Earth into space.

More cirrus clouds thus is another self-reinforcing feedback loop of accelerated warming in the Arctic. As the Gulf Stream keeps bringing ever warmer water into the Arctic Ocean, such feedbacks will further speed up warming, as discussed at the feedbacks page.

Are there geoengineering methods to reduce cirrus clouds? Seeding of high altitude clouds with ice may be able to do this, resulting in more longwave radiation escaping into space, as discussed in this study.

2 comments:

A whopping 320 000 square kms of arctic sea ice vanished in one day afew days ago.That's by far an all time record.On the satirical Shell side, I strongly recommend this activist videohttps://www.youtube.com/watch?v=nkqO-qOHFT8

Hello SamI'm watching an interesting lecture by James Anderson https://vimeo.com/126306925Lots of info on how they collect CH4, CO2 lectures from a very low flying aircraft out in Alaska and how they discern the sources and spatial distribution etc.If you didn't see it, I'm sure you'll enjoy.Have a nice dayJack!

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Global temperatures are rising fast. In the Arctic, temperatures are rising even faster (interactive charts below and right). For 2010 and 2011, NASA recorded anomalies of over 2°C at higher latitudes (64N to 90N), with anomalies of over 3°C at latitudes 79N and 81N in 2010.

For November 2010, anomalies of 12.5°C were recorded at latitude 71N, longitude -79 (Baffin Island, Canada). At specific moments in time and at specific locations, anomalies can be even more striking. As an example, on January 6, 2011, temperature in Coral Harbour, located at the northwest corner of Hudson Bay in the province of Nunavut, Canada, was 30°C (54°F) above average.